LH and LH-L Series

This series was developed with the goals of improving reliability, reducing fuel oil consumption, and achieving a compact size. It has been simplified by shortening the cylinder pitch and locating the maneuvering handle and attached pumps on the stern side to make it lightweight and compact. Furthermore, the bow power takeoff has been located on the engine face to shorten the overall length of the engine bow face, the framework and cylinder have been unified, and the intake air manifold and main cooling water inlet piping have been integrated on the cylinder frame.

Based on the LH model engine, the stroke was made longer, and in order to improve the thermal efficiency, the maximum cylinder combustion pressure was increased and improvements were made to strengthen its component parts. Since its revolution speed is low, it is well-suited to directly connected engines not equipped with a reduction gearbox.

Also, the 3 LH38L, LH41L, and LH46L models can be selected to use a hydraulic valve driving system or the conventional push rod valve driving system. Models with a bore larger than 340 mm use an L-save ring, which can prevent wear of the liner cylinder wall surfaces caused by hard carbon, and can suppress increases in lubrication oil consumption.